Connecting structure for special-shaped pipeline of aircraft fluid system

Abstract

The utility model provides a connecting structure for special-shaped pipelines of an airplane fluid system, which comprises a main pipe, a sub-pipe and a sealing element, the main pipe and a first special-shaped pipe are integrally formed, the sub-pipe and a second special-shaped pipe are integrally formed, the main pipe is provided with a containing cavity matched with the sub-pipe in shape, and the main pipe is matched with the sub-pipe in an inserted mode through the sealing element. And the first special-shaped pipe and the second special-shaped pipe are connected. The primary pipe and the first special-shaped pipe as well as the secondary pipe and the second special-shaped pipe are manufactured by adopting an integral forming process, so that the integral strength and stability of the connecting structure are improved, connecting points are reduced, and the leakage risk is reduced. The containing cavity accurately matched with the shape of the sub-pipe is formed in the main pipe, so that the sub-pipe can be inserted into the main pipe and is tightly matched with the main pipe through the sealing piece, the first special-shaped pipe and the second special-shaped pipe are directly and efficiently connected, traditional connecting pieces such as flanges and hoops do not need to be additionally used, and therefore the connecting structure is simplified, the system weight is reduced, and the connecting efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation manufacturing, in particular to a connection structure for special-shaped pipelines of an aircraft fluid system. Background Art

[0002] Aircraft fluid pipelines are used to transport, distribute, mix, separate, exhaust, meter or cut off fluid flow. They are also widely used in important systems such as aircraft fuel, hydraulics and environmental control.

[0003] Currently, the connection structures of aircraft fluid system pipelines are mainly divided into threaded connections, welding, flange connections, and clamp connections. However, each method has its specific application scenarios and limitations:

[0004] 1. When the internal medium pressure of the threaded connection is high, its sealing effect is often not ideal, and it is difficult to apply to the connection of non-metallic pipes.

[0005] 2. Welding is a non-detachable connection with poor maintainability, and is also not suitable for connecting non-metallic pipes.

[0006] 3. Flange connections are usually used to connect metal pipes with larger diameters and rely on bolts and gaskets to achieve sealing, but in non-metallic pipelines, the applicability of bolt and flange connections is limited.

[0007] 4. Clamp connections, with their advantages of easy installation and excellent maintainability, play an important role in connecting metallic and non-metallic pipes in aircraft. However, when dealing with special-shaped pipes in fluid systems, their sealing performance is often insufficient and difficult to meet sealing requirements.

[0008] In view of the above situation, although the patents with application numbers CN201420464944.X, CN201420812899.2, CN201721029257.5 and CN201710852498.8 solve certain problems in conventional pipe connections to a certain extent.

[0009] However, there are still deficiencies in improving the sealing performance of special-shaped pipes in aircraft fluid systems. Due to the special shape of special-shaped pipes, most of them can only be connected by clamps. The clamps cannot fit the shape of the special-shaped pipes, resulting in uneven force at the connection between the two special-shaped pipes. The sealing effect may not reach the ideal state, causing fluid leakage and affecting the normal operation and safety of the fluid system.

[0010] In view of this, the present utility model is proposed. Utility Model Content

[0011] The present utility model aims to provide a connection structure for special-shaped pipes in aircraft fluid systems. This structure addresses the technical problems of existing aircraft fluid system connection structures, which suffer from design flaws, insufficient sealing performance, difficulty in effectively sealing special-shaped pipes, and the tendency for leaks to form, thus affecting the normal operation and safety of the fluid system. The various technical effects achieved by the preferred technical solution among the various technical solutions provided by this utility model are detailed below.

[0012] To achieve the above objectives, the present invention provides the following technical solutions:

[0013] The utility model provides a connection structure for special-shaped pipes of an aircraft fluid system, comprising a mother pipe, a daughter pipe and a sealing member. The mother pipe is integrally formed with a first special-shaped pipe, and the daughter pipe is integrally formed with a second special-shaped pipe. The mother pipe has a receiving cavity that is adapted to the shape of the daughter pipe, and is plugged into and matched with the daughter pipe through a sealing member to connect the first special-shaped pipe and the second special-shaped pipe.

[0014] Preferably, the inner diameter of the accommodating cavity is larger than the inner diameter of the first special-shaped tube, and a step structure is formed between the two, and the inner diameter of the sub-tube is the same as the inner diameter of the second special-shaped tube.

[0015] Preferably, the outer diameter of the mother tube is larger than the outer diameter of the first special-shaped tube, and the outer wall surfaces of the two are connected in an inclined transition.

[0016] Preferably, the shapes of the accommodating cavity and the sub-tube include elliptical, semi-elliptical or any standard or non-standard geometric shape.

[0017] Preferably, the sealing member includes a sealing rubber ring.

[0018] Preferably, the sealing rubber ring includes a first sealing layer, an air layer and a second sealing layer, and the air layer is located between the first sealing layer and the second sealing layer.

[0019] Preferably, the sealing rubber ring is bent outwards at one end close to the mother tube, so that the sealing rubber ring forms a P-shaped structure.

[0020] Preferably, the air layer at the straight portion of the sealing rubber ring is not connected to the air layer at the large head portion of the sealing rubber ring.

[0021] Preferably, the sealing rubber ring is an annular structure.

[0022] The preferred technical solution of the utility model can also produce at least the following technical effects:

[0023] The present invention effectively avoids the technical problems existing in the prior art in the design of the connection structure of the pipeline of the aircraft fluid system, such as the insufficient sealing performance of the special-shaped pipeline, the difficulty in effectively achieving sealing, the easy formation of leakage points, and the impact on the normal operation and safety of the fluid system. The present invention provides a connection structure for the special-shaped pipeline of the aircraft fluid system, including a mother pipe, a daughter pipe and a seal. The mother pipe is integrally formed with the first special-shaped pipe, and the daughter pipe is integrally formed with the second special-shaped pipe. The mother pipe has a receiving cavity that matches the shape of the daughter pipe, and is plugged into and matched with the daughter pipe through the seal to connect the first special-shaped pipe and the second special-shaped pipe. The mother pipe and the first special-shaped pipe, the daughter pipe and the second special-shaped pipe of the present invention are all manufactured using an integrated molding process, which not only improves the overall strength and stability of the connection structure, but also reduces the number of connection points and reduces the risk of leakage. A receiving cavity that precisely matches the shape of the daughter pipe is provided in the mother pipe, so that the daughter pipe can be inserted and tightly matched with it through the seal, effectively preventing fluid leakage even under extreme working conditions such as high pressure and high temperature. The plug-in connection between the mother tube and the daughter tube directly and efficiently connects the first and second special-shaped tubes, eliminating the need for traditional connectors such as flanges and clamps. This simplifies the connection structure, reduces system weight, and improves connection efficiency. This system is suitable not only for connecting metallic pipes, but also for connecting non-metallic pipes and mixed connections between metallic and non-metallic pipes, providing strong technical support for the diverse pipe connection needs of aircraft fluid systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a schematic diagram of the first type of structure in an exploded state of a connection structure for special-shaped pipelines in an aircraft fluid system provided by the utility model;

[0026] Figure 2 This is a schematic diagram of the second type of structure in a disassembled state of a connection structure for special-shaped pipelines in an aircraft fluid system provided by the present invention;

[0027] Figure 3 This is a structural diagram of the first special-shaped tube provided by the utility model;

[0028] Figure 4 This is a structural diagram of the second special-shaped tube provided by the utility model;

[0029] Figure 5This is a structural schematic diagram of the third special-shaped tube provided by the utility model.

[0030] In the picture:

[0031] 1. Main tube; 2. Sub-tube; 3. Sealing rubber ring; 31. First sealing layer; 32. First air layer; 33. Second sealing layer; 34. Large head; 35. Second air layer; 4. First special-shaped tube; 5. Second special-shaped tube; 6. Step structure. DETAILED DESCRIPTION

[0032] To make the purpose, technical solution, and advantages of the present invention more clear, the technical solution of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0033] The utility model provides a connection structure for special-shaped pipes of an aircraft fluid system, comprising a mother pipe, a daughter pipe and a sealing member. The mother pipe is integrally formed with a first special-shaped pipe, and the daughter pipe is integrally formed with a second special-shaped pipe. The mother pipe has a receiving cavity that is adapted to the shape of the daughter pipe, and is plugged into and matched with the daughter pipe through the sealing member to connect the first special-shaped pipe and the second special-shaped pipe.

[0034] The mother tube and the first special-shaped tube, the daughter tube and the second special-shaped tube of the utility model are all manufactured by an integrated molding process, which not only improves the overall strength and stability of the connection structure, but also reduces the number of connection points and reduces the risk of leakage. A accommodating cavity that precisely matches the shape of the daughter tube is provided in the mother tube, so that the daughter tube can be inserted and tightly fitted with it through a seal, which can effectively prevent fluid leakage even under extreme working conditions such as high pressure and high temperature. The first special-shaped tube and the second special-shaped tube are directly and efficiently connected by plugging the mother tube and the daughter tube, without the need for additional traditional connectors such as flanges and clamps, thereby simplifying the connection structure, reducing the weight of the system, and improving the connection efficiency. It is not only suitable for connections between metal pipes, but also for mixed connections between non-metallic pipes and between metal and non-metallic pipes, providing strong technical support for the diversified pipe connection needs of aircraft fluid systems.

[0035] As an optional embodiment, the inner diameter of the accommodating cavity is larger than the inner diameter of the first special-shaped tube, and a step structure is formed between the two, and the inner diameter of the sub-tube is the same as the inner diameter of the second special-shaped tube.

[0036] Furthermore, the inner diameter of the accommodating cavity is larger than the inner diameter of the daughter tube. The accommodating cavity provides accommodation space for the daughter tube so that the daughter tube can be smoothly inserted into the accommodating cavity of the mother tube, and also allows a seal to be installed between the mother tube and the daughter tube to ensure sealing between the two.

[0037] Since the inner diameter of the accommodating cavity is larger than the inner diameter of the first special-shaped tube, the transition area of ​​the inner wall between the two forms a stepped structure, which not only enhances the structural strength of the mother tube, but also provides a stable supporting surface for the seal.

[0038] As an optional implementation, the outer diameter of the mother tube is larger than the outer diameter of the first special-shaped tube, and the outer wall surfaces of the two are connected at an inclined transition to improve the overall structural strength.

[0039] As an optional embodiment, the shapes of the accommodating cavity and the sub-tube include elliptical, semi-elliptical or any standard or non-standard geometric shape.

[0040] The shape of the sub-tube is the same as that of the second special-shaped tube, and the shape of the accommodating cavity is adapted to the shape of the sub-tube, so that the connecting structure can closely adapt to the shapes of various special-shaped pipelines.

[0041] As an optional embodiment, the sealing member includes a sealing rubber ring.

[0042] The sealing rubber ring is made of compressible non-metallic elastic material in the existing technology. As long as it has good elasticity and resilience, it can fit tightly between the main pipe and the sub-pipe when under pressure to form an effective sealing barrier.

[0043] As an optional embodiment, the sealing rubber ring includes a first sealing layer, a first air layer and a second sealing layer, and the first air layer is located between the first sealing layer and the second sealing layer.

[0044] The first sealing layer abuts against the inner wall of the mother tube, and the second sealing layer abuts against the outer wall of the daughter tube. The design of the first air layer can increase the elasticity of the sealing rubber ring to a certain extent, better adapt to the slight deformation of the connection between the mother tube and the daughter tube, further improve the sealing effect, and ensure that no fluid leakage occurs at the connection between the mother tube and the daughter tube.

[0045] As an optional implementation, the sealing rubber ring is bent outwardly at one end close to the mother tube, so that the sealing rubber ring forms a P-shaped structure.

[0046] Furthermore, the large head of the sealing rubber ring abuts against the stepped structure formed between the mother tube and the first special-shaped tube, thereby increasing the contact area between the sealing rubber ring and the inner wall of the mother tube and improving the sealing effect.

[0047] As an optional embodiment, the first air layer of the straight portion of the sealing rubber ring is not connected to the second air layer of the large head portion of the sealing rubber ring.

[0048] The unconnected air layer makes the straight portion and the large head more independent in performance, reduces the influence between them, and improves the overall stability of the sealing rubber ring.

[0049] As an optional implementation, the sealing rubber ring is an annular structure.

[0050] The first sealing layer abuts against the inner wall of the mother tube, and the second sealing layer abuts against the outer wall of the daughter tube. The design of the air layer can increase the elasticity of the sealing rubber ring to a certain extent, better adapt to the slight deformation of the connection between the mother tube and the daughter tube, and further improve the sealing effect.

[0051] Embodiment 1:

[0052] like Figure 1 As shown, the utility model provides a connection structure for special-shaped pipes of an aircraft fluid system, including a mother pipe 1, a daughter pipe 2 and a seal. The mother pipe 1 is integrally formed with a first special-shaped pipe 4, and the daughter pipe 2 is integrally formed with a second special-shaped pipe 5. The mother pipe 1 has a accommodating cavity that is adapted to the shape of the daughter pipe 2, and is plugged into and matched with the daughter pipe 2 through a seal to connect the first special-shaped pipe 4 and the second special-shaped pipe 5.

[0053] The main tube 1 and the first special-shaped tube 4, the sub-tube 2 and the second special-shaped tube 5 of the utility model are all manufactured using an integrated molding process, which not only improves the overall strength and stability of the connection structure, but also reduces the number of connection points and reduces the risk of leakage. A accommodating cavity that precisely matches the shape of the sub-tube 2 is provided in the main tube 1, so that the sub-tube 2 can be inserted and tightly fitted with it through a seal, effectively preventing fluid leakage even under extreme working conditions such as high pressure and high temperature. The first special-shaped tube 4 and the second special-shaped tube 5 are directly and efficiently connected by plugging the main tube 1 and the sub-tube 2, without the need for additional traditional connectors such as flanges and clamps, thereby simplifying the connection structure, reducing the weight of the system, and improving the connection efficiency. It is not only suitable for connections between metal pipes, but also for mixed connections between non-metallic pipes and between metal and non-metallic pipes, providing strong technical support for the diversified pipe connection needs of aircraft fluid systems.

[0054] As an optional embodiment, the inner diameter of the accommodating cavity is larger than the inner diameter of the first special-shaped tube 4 , and a step structure 6 is formed between the two. The inner diameter of the sub-tube 2 is the same as the inner diameter of the second special-shaped tube 5 .

[0055] Furthermore, the inner diameter of the accommodating cavity is larger than the inner diameter of the sub-tube 2. The accommodating cavity provides accommodation space for the sub-tube 2 so that the sub-tube 2 can be smoothly inserted into the accommodating cavity of the mother tube 1, and also allows a seal to be installed between the mother tube 1 and the sub-tube 2 to ensure sealing between the two.

[0056] Since the inner diameter of the accommodating cavity is larger than the inner diameter of the first special-shaped tube 4, a step structure 6 is formed in the transition area of ​​the inner wall between the two, which not only enhances the structural strength of the mother tube 1 but also provides a stable support surface for the seal.

[0057] As an optional implementation, the outer diameter of the mother tube 1 is larger than the outer diameter of the first special-shaped tube 4, and the outer wall surfaces of the two are connected at an inclined transition to improve the overall structural strength.

[0058] As an optional embodiment, the shapes of the accommodating cavity and the sub-tube 2 include elliptical, semi-elliptical or any standard or non-standard geometric shape.

[0059] The shape of the sub-tube 2 is the same as that of the second special-shaped tube 5, and the shape of the accommodating cavity is adapted to the shape of the sub-tube 2, so that the connection structure can closely adapt to the shapes of various special-shaped pipelines. Figure 3 As shown, the cross-sectional shapes of the receiving cavity of the mother tube 1, the daughter tube 2 and the second special-shaped tube 5 can be regular elliptical. Figure 4 As shown, the cross-sectional shapes of the receiving cavity of the mother tube 1, the sub-tube 2 and the second special-shaped tube 5 can be regular circular shapes. Figure 5 As shown, the cross-sectional shapes of the accommodating cavity of the mother tube 1, the daughter tube 2 and the second special-shaped tube 5 can be irregular.

[0060] As an optional embodiment, the sealing member includes a sealing rubber ring 3 .

[0061] The sealing rubber ring 3 is made of a compressible non-metallic elastic material in the prior art. As long as it has good elasticity and resilience, it can fit tightly between the main pipe 1 and the sub-pipe 2 when under pressure to form an effective sealing barrier.

[0062] As an optional embodiment, the sealing rubber ring 3 includes a first sealing layer 31 , a first air layer 32 and a second sealing layer 33 , and the first air layer 32 is located between the first sealing layer 31 and the second sealing layer 33 .

[0063] The first sealing layer 31 abuts against the inner wall of the mother tube 1, and the second sealing layer 33 abuts against the outer wall of the sub-tube 2. The design of the first air layer 32 can increase the elasticity of the sealing rubber ring 3 to a certain extent, better adapt to the slight deformation of the connection between the mother tube 1 and the sub-tube 2, further improve the sealing effect, and ensure that no fluid leakage occurs at the connection between the mother tube 1 and the sub-tube 2.

[0064] As an optional embodiment, the sealing rubber ring 3 is an annular structure.

[0065] The first sealing layer 31 abuts against the inner wall of the mother tube 1, and the second sealing layer 33 abuts against the outer wall of the daughter tube 2. The design of the air layer can increase the elasticity of the sealing rubber ring 3 to a certain extent, better adapt to the slight deformation of the connection between the mother tube 1 and the daughter tube 2, further improving the sealing effect. It can also well adapt to the shape, specifications or irregularities of the daughter tube 2.

[0066] Example 2:

[0067] The difference between this embodiment 2 and embodiment 1 is that: Figure 2 As shown, the end of the sealing rubber ring 3 close to the mother tube 1 is bent outward, so that the sealing rubber ring 3 forms a P-shaped structure.

[0068] Furthermore, the large head portion 34 of the sealing rubber ring 3 abuts against the stepped structure 6 formed between the mother tube 1 and the first special-shaped tube 4, thereby increasing the contact area between the sealing rubber ring 3 and the inner wall of the mother tube 1 and improving the sealing effect.

[0069] As an optional embodiment, the first air layer 32 of the straight portion of the sealing rubber ring 3 is not connected to the second air layer 35 of the large head portion 34 of the sealing rubber ring 3 .

[0070] The disconnected air layer makes the straight portion and the large head portion more independent in performance, reduces the influence between them, and improves the overall stability of the sealing rubber ring 3.

[0071] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0072] In the description of the present invention, it should be noted that, unless otherwise specified, "plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be construed as limiting the present invention. In addition, the terms "first", "second", "third", etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0073] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model depending on the specific circumstances.

[0074] Throughout this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "an example" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0075] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A connection structure for special-shaped pipelines in aircraft fluid systems, characterized in that: It includes a mother tube, a child tube and a seal. The mother tube is integrally formed with the first special-shaped tube, and the child tube is integrally formed with the second special-shaped tube. The mother tube has a accommodating cavity that is adapted to the shape of the child tube, and is plugged into and matched with the child tube through a seal to connect the first special-shaped tube and the second special-shaped tube.

2. A connection structure for special-shaped pipelines in aircraft fluid systems according to claim 1, characterized in that: The inner diameter of the accommodating cavity is larger than the inner diameter of the first special-shaped tube, and a step structure is formed between the two. The inner diameter of the sub-tube is the same as the inner diameter of the second special-shaped tube.

3. The connection structure for special-shaped pipelines of an aircraft fluid system according to claim 1, characterized in that: The outer diameter of the mother tube is larger than the outer diameter of the first special-shaped tube, and the outer wall surfaces of the mother tube and the first special-shaped tube are connected at an inclined transition.

4. The connection structure for special-shaped pipelines of an aircraft fluid system according to claim 1, characterized in that: The shapes of the accommodating cavity and the sub-tube include elliptical, semi-elliptical or any standard or non-standard geometric shape.

5. The connection structure for special-shaped pipelines of an aircraft fluid system according to claim 1, characterized in that: The sealing member includes a sealing rubber ring.

6. The connection structure for special-shaped pipelines in aircraft fluid systems according to claim 5, characterized in that: The sealing rubber ring includes a first sealing layer, an air layer and a second sealing layer, and the air layer is located between the first sealing layer and the second sealing layer.

7. The connection structure for special-shaped pipelines in aircraft fluid systems according to claim 6, characterized in that: The sealing rubber ring is bent outwards at one end close to the mother tube, so that the sealing rubber ring forms a P-shaped structure.

8. The connection structure for special-shaped pipelines in aircraft fluid systems according to claim 7, characterized in that: The air layer of the straight portion of the sealing rubber ring is not connected to the air layer of the large head portion of the sealing rubber ring.

9. The connection structure for special-shaped pipelines in aircraft fluid systems according to claim 6, characterized in that: The sealing rubber ring is an annular structure.

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